It's indicative of how immigration is changing not only the look and feel of our towns and cities, but the sounds of them also. And as we all know, immigration is the main concern of huge numbers of British referendum voters.... I did try to sweeten the pill for the more sensitive with a touch of humour. As such it's totally relevant.
Our government wants immigration because half of our NHS and other vital services are filled with foreign workers as it's the only way our country can afford to maintain that level of service. Leaving the EU wont make any difference to our country's need for migrant workers.
Secondly, if we want to maintain any sort of common market access such as Norway does (the example many Leave campaigners keep throwing around) then we'd have to accept free movement as a condition of that. Otherwise we lose access. And yes, that is the way it is.